v-if inside of <teleport> fails when having multiple <teleport> children

[maxschwarzmueller]

Version

3.0.0-rc.6

Reproduction link

https://jsfiddle.net/hm2xszge/

Steps to reproduce

1. Open JSFiddle Link
2. Click "Open Dialog" Button
3. Click "Close Dialog" Button inside of Modal

What is expected?

The dialog/ modal should close.

What is actually happening?

Closing fails and an error is thrown in the JS console in the dev tools:

Uncaught (in promise) TypeError: Cannot read property 'insertBefore' of null ...

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It's possible that I'm using <teleport> in an invalid way:
Is <teleport> meant to be used with only one child element? I didn't find anything about that in the docs/ API reference.